VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/asm/ASMAtomicCmpXchgU8.asm@ 93943

Last change on this file since 93943 was 93115, checked in by vboxsync, 3 years ago

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File size: 2.0 KB
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1; $Id: ASMAtomicCmpXchgU8.asm 93115 2022-01-01 11:31:46Z vboxsync $
2;; @file
3; IPRT - ASMAtomicCmpXchgU8().
4;
5
6;
7; Copyright (C) 2006-2022 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27;*******************************************************************************
28;* Header Files *
29;*******************************************************************************
30%include "iprt/asmdefs.mac"
31
32BEGINCODE
33
34;;
35; Atomically compares and exchanges an unsigned 8-bit int.
36;
37; @param pu8 x86:esp+4 msc:rcx gcc:rdi
38; @param u8New x86:esp+8 msc:dl gcc:sil
39; @param u8Old x86:esp+c msc:r8l gcc:dl
40;
41; @returns bool result: true if successfully exchanged, false if not.
42; x86:al
43;
44RT_BEGINPROC ASMAtomicCmpXchgU8
45%ifdef RT_ARCH_AMD64
46 %ifdef ASM_CALL64_MSC
47 mov al, r8b
48 lock cmpxchg [rcx], dl
49 %else
50 mov al, dl
51 lock cmpxchg [rdi], sil
52 %endif
53%else
54 mov ecx, [esp + 04h]
55 mov dl, [esp + 08h]
56 mov al, [esp + 0ch]
57 lock cmpxchg [ecx], dl
58%endif
59 setz al
60 movzx eax, al
61 ret
62ENDPROC ASMAtomicCmpXchgU8
63
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